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8-4
RF2870
Rev A8 030507
Evaluation Board Current Measurement (Typical Values for VCC=2.75V)
NOTES:
All IDC current numbers include bias circuitry current of 1.5mA to 2.0mA (dependent on mode).
TX Buffer On: Add 2.4mA to total current.
Cascaded Performance (Typical Values for VCC=2.75V)
NOTE: All total current numbers include bias circuitry current of 1.5mA to 2.0mA (dependent on mode).
Gain Control State Table
ENABLE
LNA
GAIN
MIX
GAIN
TX BUFF
ENABLE
IDC
(mA)
Gain Control State
Power Down
0
X
X
X
<0.01
LNA On, Mixer Preamp On,
TX Buffer Off
10
0
0
26.5
LNA On, Mixer Preamp Off,
TX Buffer Off
10
1
0
20.6
LNA Bypassed, Mixer Preamp On,
TX Buffer Off
11
1
0
20.9
LNA Bypassed, Mixer Preamp Off,
TX Buffer Off
11
0
0
15.0
CELL CDMA
Parameter
LNA ON
LNA OFF
LNA ON
LNA OFF
Mixer Preamp On
Mixer Preamp Off
Cascaded:
Gain (dB)
25.0
7.5
14.0
-3.5
Noise Figure (dB)
1.9
12.0
4.5
19.5
Input IP3 (dBm)
-9.0
+8.4
+2.0
+18.8
LO to IF Isolation (dB)
30
30
30
30
IF1 to RF Isolation (dB)
40
40
40
40
IF2 to RF Isolation (dB)
40
40
40
40
LO to LNA IN Isolation (dB)
45
45
45
45
Total Current (mA)
26.5
20.9
20.6
15.0
NOTE: Assumes 2.5dB image filter insertion loss. The TX Buffer Enable is off.
Corresponding Device State
Gain State
LNA Gain
Logic Input
Mix Gain
Logic Input
LNA
Amplifier
Mixer
Preamp
Comments
High Gain
0
0
On
On
IMD Test 1 and 2
Mid Gain
0
1
On
Off
IMD Test 3 and 4
Low Gain
1
1
Off
On
IMD Test 5 and 6
Ultra-Low Gain
1
0
Off
Off
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